Power Rake Drum and Retractable Blade for Single-Pass Grading
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Solution Overview
Problem
Existing power rakes face issues with clogging in wet or sticky conditions, require separate operations for raking and levelling, and have reliability and maintenance challenges due to complex bearing designs and large drum diameters, leading to increased time, expense, and operator downtime.
Innovation Solution
A ground working accessory with a lateral rotatable powered drum assembly and a forward blade assembly that can be raised and lowered, featuring a flexible barrier and external motor mounting, allowing for simultaneous raking and levelling operations with a compact design that reduces clogging and maintenance needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional power rake with a fixed barrier is used, then it can prevent large objects from passing over the drum, but it causes clogging in wet or sticky conditions requiring operator intervention to clear
Solution Approach 1:
The barrier is made movable rather than fixed, allowing it to dynamically adjust its position. It can move forward to prevent large objects from passing over the drum, and move backward to clear clogged material, eliminating the need for operator intervention and maintaining operational continuity
Solution Approach 2:
The barrier automatically clears itself of clogged material by moving backward under its own weight or spring force when material accumulates, without requiring external operator intervention to reset or clear it
2Ease of manufacture
If power raking and levelling are performed as separate operations, then each function can be optimized independently, but it requires multiple passes increasing time and cost
Solution Approach 1:
The power rake drum and levelling blade are combined into a single integrated accessory that performs both functions simultaneously. The drum breaks up and rakes the ground surface while the blade levels it in the same pass, eliminating the need for separate operations and reducing time and cost
Solution Approach 2:
The accessory is designed to perform multiple functions - power raking, levelling, and grading - all in one unit. This multi-functional design allows a single accessory to replace what previously required multiple separate operations or accessories
3Area of stationary object
If a large diameter drum is used, then it provides better ground coverage and raking effectiveness, but it increases drum inertia and reduces responsiveness
Solution Approach 1:
The drum features localized protruding features (teeth or tines) concentrated at specific locations rather than a uniform surface. This allows effective ground engagement and raking action at these localized points while maintaining a smaller overall drum diameter, improving responsiveness without sacrificing ground coverage effectiveness
4Stability of the object's composition
If complex bearing designs are used to support the drum, then rotational stability is improved, but maintenance complexity and downtime increase
Solution Approach 1:
The bearing support system is extracted and simplified to basic structural supports rather than complex bearing assemblies. The drum is supported on simple pivots or fixed mounts that are easy to access and maintain, eliminating the need for complex bearing designs while maintaining sufficient rotational stability for the application
Data Source
AI summary
The invention is directed to power rake accessories, with a powered toothed drum, attachable to supporting vehicles. Preferred embodiments include a forward mounted retractable blade portion which can be lowered for levelling/grading operations, or raised for pure raking. Disclosed also are dual blade edge variants with different functionality in forward and reverse operations, and a retractable drum wiping blade.